Merge pull request #6538 from Kilo-Org/christiaan/another-reasoning-fix-attempt

Update duplicate reasoning hack after OpenRouter AI SDK patch

packages/opencode/src/provider/transform.ts

@@ -252,25 +252,39 @@ export namespace ProviderTransform {
   }
 
   // kilocode_change - function added
-  function fixDuplicateReasoning(msgs: ModelMessage[]) {
+  function fixDuplicateReasoning(msgs: ModelMessage[], model: Provider.Model) {
     for (const msg of msgs) {
-      if (!Array.isArray(msg.content)) {
+      if (msg.role !== "assistant" || !Array.isArray(msg.content)) {
         continue
       }
-      let isFirstToolCall = true
+      const set = new Set<string>()
       for (const part of msg.content) {
-        if (part.type === "reasoning") {
-          // this entry is corrupt
-          delete part.providerOptions?.openrouter?.reasoning_details
-        }
-        if (part.type === "tool-call" && isFirstToolCall) {
-          isFirstToolCall = false
+        const openrouterProviderOptions = part.providerOptions?.openrouter as
+          | {
+              reasoning_details?: { data?: string; text?: string; signature?: string }[]
+            }
+          | undefined
+        if (!openrouterProviderOptions || !openrouterProviderOptions.reasoning_details) {
           continue
         }
-        if (part.type === "tool-call") {
-          // this is a duplicate entry
-          delete part.providerOptions?.openrouter?.reasoning_details
-        }
+        openrouterProviderOptions.reasoning_details = openrouterProviderOptions.reasoning_details.filter((rd) => {
+          if (rd.data) {
+            if (!set.has(rd.data)) {
+              set.add(rd.data)
+              return true
+            }
+            return false
+          }
+          if (rd.text) {
+            if ((model.family === "claude" || model.id.includes("claude")) && !rd.signature) return false
+            if (!set.has(rd.text)) {
+              set.add(rd.text)
+              return true
+            }
+            return false
+          }
+          return true
+        })
       }
     }
   }
@@ -282,7 +296,7 @@ export namespace ProviderTransform {
     // kilocode_change - workaround for @openrouter/ai-sdk-provider v1 duplicating reasoning
     // fixed in https://github.com/OpenRouterTeam/ai-sdk-provider/pull/344/
     if (model.api.npm === "@kilocode/kilo-gateway") {
-      fixDuplicateReasoning(msgs)
+      fixDuplicateReasoning(msgs, model)
     }
 
     if (